SU1581728A1 - Adhesive composition - Google Patents

Abstract

The invention relates to the field of producing cold-setting adhesives, in particular, to an adhesive composition, and is intended to fasten vulcanized rubbers among themselves to a metal. The invention makes it possible to improve the confection properties, increase the viability and viscosity stability of the adhesive composition after long-term storage of the starting components while maintaining the strength of attachment at normal and elevated temperature of rubber to metal due to the fact that the composition contains as a butadiene nitrile rubber the butadiene nitrile rubber obtained in the presence of an alkyl sulfonate emulsifier 36-40% by weight of acrylic acid nitrile units / BNK /, dimerized condensation product as a hardener esters of vegetable oils and polyethylene polyamines (PCs) and additionally copolymers of butadiene and nitriles of acrylic and methacrylic acids with 4-11% by weight of carboxylate groups / SPL /, and also epoxy resin of 6.8-8.3% by weight of epoxy groups / EA / and the condensation product of epichlorohydrin with novolac phenol-formaldehyde resin with 22 wt.% epoxy groups / PKE /. The composition according to the invention contains the following components, by weight parts: BNK 20-40

CPF 60-80

Dianova epoxy resin with 22 wt.% epoxy groups 120-140

ED 120-140

SCE 450-510

PK 350-500

ethyl acetate 1500-2500. 1 hp ff, 1 tab.

Description

The invention relates to the manufacture of cold-setting adhesives, in particular, to an adhesive composition, and is intended to attach vulcanized rubbers to each other and to the metal.

The purpose of the invention is to improve the confection properties; increase in gien-ability and viscosity stability of the adhesive composition after prolonged

storing the original components while maintaining the strength of attachment at normal and elevated temperatures of rubber to metal.

As butadi-nitrile rubber, the mixture contains butadiene-nitrile rubber obtained in the presence of an alkyl sulfate emulsifier.

from 36-40 wt.% units of nitrite acrylic acid.

As a copolymer of butadiene and nitriles of acrylic and methacrylic acids with 4-11% by weight of carboxylate groups, rubbers are used: SKN-26-5, which contains 4-6 May, 7, carboxylate groups and is intended for the manufacture of rubber and electronic products and SKN - -26-10, with the content of carboxylate groups of 8-11 wt.%.

As the condensation product of epichlorohydrin with Novolac Phenol-formaldehyde resin with 22 wt.% Of epoxy groups, the UP-643 resin is used.

As epoxy resin Dianova with 6.8-8.3 wt.% Epoxy groups use resin 3-41 with 22 wt.% ED-20. As the condensation product of dimerized esters of vegetable oil acids and polyethylene amines, PO-300 resin was used.

The adhesive composition consists of two components: a solution in ethyl acetate of the first component, which is a rubber compound5 consisting of the rubber compound SKI-40C and SKN-26-10 (IPI SKN-26-5) and the addition of epoxy resins and the second Component - hardener - resin PO-300 (or its solution in ethyl acetate),

The adhesive composition is prepared by mixing the first component with the second component mixing them until a uniform mass is formed.

The invention is illustrated by examples of adhesive compositions presented in the table.

Example 1 (control). Rubber mixture consisting of 50 ma.h. rubber GKH-40C, 5b wt.h rubber SKN-26-5 with the addition of 125 wt.h. ED-20 resins, 125 mas. h. Resins E-41 and 500 mAh., resins UE-643, dissolved in 2300 mAh., of ethyl acetate to form a homogeneous mass, into which 450 m.h. The resins PO-30 and the resulting glue are evaluated for confectionary, adhesive properties and viability and stability of the properties of the adhesive during storage of the components.

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To evaluate the confectionary properties, the adhesive composition is applied in two layers on the ends of strips of rubber-fabric material with a size of mm and each layer is dried for at least 20 minutes. Then, the glued surfaces are joined by the smeared sides, providing a gluing area of 4 cm, and 5-10 minutes after gluing, the specimens are subjected to destruction on a stretching machine with a moving clip speed of 50 mm / min to determine the shear bond strength.

The adhesive properties of the adhesive is evaluated according to GOST 411-77, method B when gluing rubber НО-68-1, including 100 parts by weight. combinations of butadiene nitrile and chloroprene rubbers, 20 math. dibutyl sebacate and other special additives, with steel 3. The surface of the rubber before applying the glue is modified with a composition based on halogensulfamide. Glue is applied to the surfaces to be bonded with two layers with drying of each layer for at least 20 minutes. The destruction of the glued specimens was carried out 48 hours after gluing at a test temperature of respectively 20 + 2 ° C and 00 ± 2 ° C.

The viability of the glue is assessed by the change in viscosity after mixing the components,

The stability of the properties of the adhesive during long-term storage is assessed by the change in viscosity of the adhesive depending on the shelf life of the components.

Example 2-24. Adhesive compositions similar to example 1, but contain other ratios of components.

Examples 25-31. Adhesive compositions are similar to Example 1, but contain other component ratios, and rubber 51-1632 based on ethylene-propylene rubber (100 May, h) with an addition of 15 mph is used to evaluate the adhesive properties of the adhesive. oils and other target additives.

Example 32. Reflects the properties of glue of known composition ,,

Examples 33-38. The adhesive compositions are similar to Example 1, but different amounts of titanium white are additionally added to the rubber mixture.

The results of testing to mutual compositions according to the examples are summarized in the table.

Claims (2)

Formula izobreueni 1. Adhesive composition comprising nitrile-butadiene rubber, epoxy resin Dianova with 22 wt.% Epoxy groups, hardener and solvent - ethyl acetate, characterized in that, with the aim of improving the confection properties, increasing the viability and stability of the viscosity of the adhesive composition after long-term storage of the original components while maintaining the strength of attachment at normal and elevated temperatures of rubber to metal, the composition contains, as butadiene nitrile rubber, obtained in the presence of an alkyl sulfonate ester butadiene nitrile rubber with 36–40 wt.% acrylic acid nitrile, as a hardener — condensation product of dimerized esters of vegetable oil acids and polyethylene polyamines, and additionally copolymer of butadiene and nitrile of acrylic and methacrylic acids with 4–1J wt. % of carboxylate groups, as well as epoxy resin Dianova with 6.8-8.3 wt.% epoxy groups and the condensation product of epichlorohydrin with novolac phenol formaldehyde resin with 22 wt.% epoxy groups in the following ratio of components, ma.ch .: Specified nitrile butadiene rubber - 20-40. Specified copolymer of butadiene and nitriles of acrylic and methacrylic acids60-80 Epoxy Dianova resin with 22 wt.% of epoxy groups 120-140 Epoxy-Dianova resin with 6.8-8.3 wt.% of epoxy groups 120-160 Condensation product of epichlorohydrin with novolac phenol formaldehyde resin 450-510 0 Condensation product of dimerized esters of vegetable oil acids and polyethylene polyamines 350-500 Ethyl acetate 1500-2500 five 0 2. A composition according to claim 1, characterized in that it further comprises from 3 to 20 May. titanium whitewash 100 ma.ch. mixtures of butadiene-nitrile rubber and -butadiene copolymer and acrylic and methacrylic acid nitriles1. 25 25 25 25 25 75 bO 70 80 90 75 70 70 70 70 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 Ui 00-J NJ oo - U1 CO J m 00